The mutex yield step counts each yield in a counter that
MutexYieldsForTest_nid_no_patch reads. With no spins and a yield count
of 5, a waiter woken while another thread holds its mutex must yield
exactly 5 times before it blocks, for each mutex type and for the outer
level of a recursive mutex held twice. With WakingLock::lock calling
the native lock directly the count stays 0 and the test aborts.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
FreeBSD 11.4's _mutex_cv_lock takes the mutex back through
mutex_lock_common, so a woken waiter tries once, spins and yields by
the mutex's counts before it blocks. The wait here called the native
lock directly; it now goes through the same spin and yield path as
scePthreadMutexLock.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
FreeBSD's mutex_lock_common tries the lock before mutex_lock_sleep
spins or yields, so a free mutex with yield loops and no spins was
yielding before its first try here.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Lock and timed lock now try the mutex up to the spin count with a pause
between tries, then up to the yield count with a yield before each try,
before they block, as FreeBSD 11.4's mutex_lock_sleep does. Trylock and
a lock the thread already holds do not spin. A uniprocessor host skips
the spins and keeps the yields.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
